BSOD from playing any heavy 3d games, and autoCAD 2010

hi Seven forum, i'm trying to fix my 2 years old notebook ASUS g51J from searching solved problem, but somehow any solved problem similar with me still not solving my problem. my problem related to 3d, at first i thought its my nvidia driver problem, but i was wrong, reverting old driver, updating new driver not fixing the problem.

any 3d program game related goin to freeze for a while *still able to alt-tab and do something or browsing*, then resume, but sometimes the screen going to flick, goin black then windows telling me kernel display driver have been recovered or BSoD'ed.

about 2 months ago my notebook still doin fine, no crashes, bsod, any 3d work doin fine, and just recently this problem arise.

windows 7 64bit home premium
just recently clean reinstall from ASUS original disk repair, still not fixing the problem


Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7600.2.0.0.768.3
Locale ID: 1033

Additional information about the problem:
BCCode: d1
BCP1: FFFFFA90068C6BD0
BCP2: 0000000000000002
BCP3: 0000000000000000
BCP4: FFFFF88004CBE0A7
OS Version: 6_1_7600
Service Pack: 0_0
Product: 768_1

sometimes BCCode 116, but thats before reinstalling the notebook

hoping for help, since its really annoying when autoCAD suddenly freeze

thanks.

edit : added screenshot example when the screen began to flick